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bootloader.c
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bootloader.c
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/*
* Copyright (c) 2012 Jeppe Ledet-Pedersen <jlp@satlab.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <avr/wdt.h>
#include <avr/io.h>
#include <util/delay.h>
#include <LUFA/Common/Common.h>
//#include <LUFA/Drivers/USB/USB.h>
#include "bluebox.h"
uint32_t boot_key ATTR_NO_INIT;
#define FLASH_SIZE_BYTES 0x8000
#define BOOTLOADER_SEC_SIZE_BYTES 0x2000
#define MAGIC_BOOT_KEY 0xDC42ACCA
#define BOOTLOADER_START_ADDRESS (FLASH_SIZE_BYTES - BOOTLOADER_SEC_SIZE_BYTES)
void bootloader_jump_check(void) ATTR_INIT_SECTION(3);
void bootloader_jump_check(void)
{
/* If the reset source was the bootloader and the key is correct, clear it and jump to the bootloader */
if ((MCUSR & (1<<WDRF)) && (boot_key == MAGIC_BOOT_KEY)) {
boot_key = 0;
((void (*)(void))BOOTLOADER_START_ADDRESS)();
}
}
void jump_to_bootloader(void)
{
/* Disable all interrupts */
cli();
/* Wait two seconds for the USB detachment to register on the host */
for (uint8_t i = 0; i < 128; i++)
_delay_ms(16);
/* Set the bootloader key to the magic value and force a reset */
boot_key = MAGIC_BOOT_KEY;
reboot();
}